Magnetic work holder



July 29, 1958 J. H. SHAFER 2,845,273

MAGNETIC WORK HOLDER Filed Oct. 25; 1956 Fig. 4 23 1a 2/ l5 6 8 a l v 1 i H 42/ 20 I7 Fig. 3

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I W 1 John H. \Shafer 9 l9 l8 l9 22 INVENTOR.

BY wfiwyfim United States Patent MAGNETIC WORK HOLDER John H. Shafer, Cogan Station, Pa., assignor of fifty percent to Clay Whitmoyer, Washingtonville, Pa.

Application October 25, 1956, Serial No. 618,240

6 Claims. (Cl. 279-1) The present invention relates to new and useful improvements in work holders particularly for machinists and has for its primary object to provide, in a manner as hereinafter set forth, novel means for expeditiously and firmly clamping work pieces of either magnetic or non-magnetic material and various shapes and sizes in any desired position on the magnetic chuck without the necessity of resorting to other securing devices.

Another very important object of the invention is to provide a holder of the aforementioned character comprising a slidable work engaging jaw, wherein the magnetism of the chuck is utilized to assist in actuating said jaw to and retaining same in closed or operative position.

Other objects of the invention are to provide a workholding device of the character described which will be comparatively simple in construction, strong, durable, highly 'eflicient and reliable in use, compact and which may be manufactured at low cost.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of a work-holding device constructed in accordance with the present invention;

Figure 2 is a View in Vertical longitudinal section, showing the device in use;

Figure 3 is a view in vertical longitudinal section through the device, showing the jaw in retracted or inoperative position;

Figure 4 is a view in transverse section, taken substantially on the line 44 of Figure 2; and,

Figure 5 is a view in transverse section, taken substantially on the line 55 of Figure 2.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a substantially U-shaped base of suitable magnetic material which is designated generally by reference character 6. The base 6, which may also be of any desired dimensions, comprises a bight portion 7 and legs 8. The base 6 is adapted to be magnetically secured in any desired position on a conventional magnetic chuck, as indicated at 9.

The bight portion 7 of the base 6 has formed longitudinally therethrough a bore 10. Slidably mounted in the bore 10 is a jaw 11. The forward end of the jaw 11 is nailed or roughened in a manner to provide a face 12 which is engageable with the work to be secured on the chuck 9, as indicated at 13. At its rear end, the jaw '11 terminates in a slotted head 14.

A toggle 15 actuates the jaw 11. The toggle 15 includes an elongated plate 16 of suitable magnetic material having its rear end portion pivotally secured, as at 17, between the free end portions of the legs 8 of the base 6. The free end portion of the plate 16 has mounted longitudinally therein a stepped slot 18 providing furca- "ice tions 19 for the reception of the .head 14 .ofthejawll therebetween. The slot 18 also accommodates a link 20 which operatively connects the plate 16 to the jaw 11, one end portion of said link being pivotally secured, as at 21, in the slotted head 14 of said jaw. The other end portion of the link 20 is pivotally secured, as at 22, between the furcations 19.

It is thought that the operation of the device will be readily apparent, consideration of the foregoing. Briefly, two or more of the devices may be used to clamp the workpiece in position on the chuck 9, as shown in Figure 2 of the drawing. With the toggle 15 broken (see 'Figure 3) the jaw 11 is in retracted or inoperative position. A spring-pressed ball detent 23 (see Figure 4) in one side portion of the base 6 is engageable beneath the free end portion of the plate 16 for securing the toggle 15 in its broken position. The holder is placed on the chuck 9 and positioned relative to the work 13. The chuck 9 is then energized magnetically securing the :base 6 in position thereon. The plate 16 is then forced downwardly for actuating the slidable jaw 11 into engagement with the work through the medium of the link 20 in an obvious manner. The magnetism of the energized chuck 9 assists in swinging the plate 16 downwardly and then retains said plate in its operative position. This also further magnetically anchors the device in position on the chuck. Of course, to retract the jaw 11 for releasing the work, the foregoing procedure is substantially reversed.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A work holder for magnetic chucks comprising: a base of magnetic material for mounting on the chuck, a work engaging jaw mounted on said base for reciprocation to engage and disengage the work, and means mounted on the base for reciprocating the jaw and operable by the magnetism of the chuck for engaging said jaw with the work.

2. A work holder for magnetic chucks comprising: a base of magnetic material for mounting on the chuck, a work engaging jaw slidable on said base, and a toggle mounted on the base and operatively connected to the jaw for engaging same with the work.

3. A work holder for magnetic chucks comprising: a base of magnetic material for mounting on the chuck, a work engaging jaw slidable on said base, and a toggle mounted on the base and operatively connected to the jaw for engaging same with the work, said toggle being of magnetic material and operable to operative position by the magnetism of the chuck.

4. A work holder for magnetic chucks comprising: a base of magnetic material for mounting on the chuck, a work engaging jaw slidably mounted on said base, a plate of magnetic material pivotally mounted for swinging movement on the base, and a link operatively connecting said plate to the jaw for engaging said jaw with the work.

5. A work holder for magnetic chucks comprising: a substantially U-shaped base of magnetic material for mounting on the chuck, a work engaging jaw slidably mounted in the bight portion of said base, a plate of magnetic material pivotally mounted between the legs of the base, and a link operatively connecting said plate to the jaw for engaging said jaw with the work.

6. A work holder for magnetic chucks comprising: a substantially U-shaped base of magnetic material for 3 mounting on the chuck, a work engaging jaw slidably mounted in the bight portion of said base, and a toggle of magnetic material pivotally mounted between the legs of the base and operatively connected to the jaw for engaging said jaw with the work.

References Cited in the file of this patent 

